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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae354d88dc0909269a86e04adce9b5faf6b053c7241c6cf830c5b8af78eb765e' 
  AND token = 'SqLmUNTwcKwG1to9AsdsRtv1egJgI21WCH3v9No/BCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}