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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9439e94b7edddd81be9f67628fbaa5b52454bd46d9aec00afcc7b5776b79f5a7' 
  AND token = '0hSlgoFShnb8flQWRXtkgNTRCtMHJ/CJN9RBWh7ECxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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