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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4909a1bb45bcd0a0a9db5b48de11283c9b0b8a475c084c36c4570ce18efb4a' 
  AND token = 'bsHQt9lWYthH/jb/jJrQV4EdsI2qT/GNkqtsiOohMQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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