SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f5603e86b9c02e96475fd78a309463e51ed47d2318f7fc41bf32c81df3d84c' 
  AND token = 'Y19xJFRr/PlXUmaGV4CPMIzgCfMMOGcvsnpwxTNXUwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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