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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38f30c3de3d35d75eba5caad7b6452929b391bf0212b2bd880832c8192ba99a' 
  AND token = 'hBeHWSyD4ByLaFgh6u9EUCjfTPriprBG8d+L2qZOK58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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