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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52010d7df854249319124747554daf689f6014cea163ad430048844f0ad4056' 
  AND token = '3pFQM1tAn8YE3uUKoso5Z9TTVObSH9zuLVXDaglkiHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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