SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7636107c5f803cd528cc51cc2b9859e6514a2194871d3a55715762590ba15bf' 
  AND token = 'Zp38VvqeHgtQwuoYx9KYCmxuW4m2esEsDTO+bDXVrqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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