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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79383175338041dcf0283bd4eda1f565985449993d4f12d7a744e3fa942f3427' 
  AND token = 'C74taumSfj9yZ1HoCKOgsMBjf45eapW1JngtPDDS9gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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