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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299210589cefca17b7553d0b33bb2a439ff06d0462e250ae8b5469e157e92abd' 
  AND token = 'FklcrhCI0teHkG6uDDKd1/dTs/UwQn3Pnu+8QJzpKFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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