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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d5318c9fd9c37115052888769a63f8dff93fb68f3399602223fef596529e54' 
  AND token = 'KnN6I4EjIs8vH9ZpJgxrFxI5rxIiz3ntblEHqZhNxWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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