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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98995f1843a7fe83b53cbc0f4b271e06ba65c2dbd19683bcec10b1c0b4efeab4' 
  AND token = '7JchUlNTwTMjAo9/8xrf9Jwr5BKNquUyxNUo2wtww9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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