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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb348ec0581aee1e6afbb0dc0c570bfa1c9b563e9ce758ff29726d6a974cd2a' 
  AND token = 'V5uUFGzVWOY74HYqRr8xksOA57gMvvhMTor9O2HtO+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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