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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f570af7909a905cf4b25871f6eb5ab4e76c0f4062b5adfa7d1762e98da2052' 
  AND token = 'zJpS6ixWF1X4KO8VZUt6g6EbgCtj/WbdmUpjJLdlG+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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