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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e104f329cd0076373dd45185e1016d73f2ada6620e2bb0285d914fa290d043f0' 
  AND token = 'ivVEKUyIEkD7pES4Asp4KtTgrAN0HtdZbPRB8AxKxn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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