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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7a20a1ab6799564e7a9478a6ca580f55d7cf8f8bfcbebdafd6e7d019569516' 
  AND token = 'f1WVEbwuS1LvX+OnOtzPZv4KJ+5U7QPS2OTxBBhokH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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