SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac797cf163e8104268cb03a5b3624924dac192ed3dc9064c7f7cf004987ead0' 
  AND token = '+eUQQVmuktORFxEAUYkuzIv9M1XBZRM9b+/pFHqSqDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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