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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9386a517e55200a5b6edf4d95f7e2bf57bb5d9fd8a6a1f7ed3eea12915188911' 
  AND token = '8BYrmte1e2nR9s8DnQpi58b+cUX8LiEgzkct2BQCFIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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