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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acccb0e8e0dcd171ebe9c623be68cfc90b7cb10f4a13d469c7bd363ef96af8f3' 
  AND token = 'l0rAwd6l1N2FVz6Iv1fDlLS6HWlXDracTsCb6wIC6AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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