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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6af0ca95e3736a9a538ee2f2d8484e0155fb1db79bfd5ea575f9ce29e2d6507' 
  AND token = 'bScHNfbCVQqtyp/EuKADos10x6QYx+HP2zeCCnQv4mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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