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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75772f9aa6c6d7a3729fd0647ab36160a8bc7690ce23e23769e0fd3394299a5' 
  AND token = 'XWHhsrZZP8l+RxMxAZqdz9zEKcbTrmR2FZ8E3B8gjOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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