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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffa2f70ecf019f592fecbebb19987166699ece4584a68848da46917843ffce2' 
  AND token = 'kA6e813t6l2vpi5Aq1BsB7JxpDKOL6vRf4xAknA2q04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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