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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17570acb55da142f5d655b970ba2217387361f8f863ee2fa12e82a69458af84' 
  AND token = 'xKyc0CJ0m1Z0/3L6qJ8rqnzKMq8cqKUYyH2bnABHebE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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