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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59741c6ff6c98905195ccfdf5eea2c9a72791418c24053adf30329d698e892c' 
  AND token = 'w3jTqD0NXe6A+ANxczhEA2Qwg6zI2O7mA7af0KUOtJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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