Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca83aca2759be6735a3a2bee3eaaef64b4a8f14e4392133606888527312daecc' 
  AND token = 'EE5d4C5VHNzG5w6fNvOnrsZYGXfMEFieD0keRn3h5wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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