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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837a06e2017465c6da72f98b05adcdc661ba0035259b2a908edaa671f19f341f' 
  AND token = '0KF1b3wbh2Z6Bh203DL/yOcL8TUfRznRepjdtfY4Qow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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