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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4a520a2ffbfc803d38a505f017de59b7647b7ca0d51ebf604aaebaa1127c27' 
  AND token = 'cqkLX6Xy9fyRSyWZY7OzRTnv0dvZGBgxSjIXvfO0wV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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