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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d79d805c54af55b28d59f2799e546249f4a133ba2c768c04502153dc0604f1' 
  AND token = 'Ok90sed0JeQfRVRYlzHPbGtPR6x1WFBJ1No05reljUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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