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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849d320738f80650ed1702ecf55ba85d5168f2c26a3051bc8761edc8898bc15a' 
  AND token = 'e0SRWxHzrt5JEj6M2TPNQe66kNg181x+ZGDph8dMHw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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