SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ede7d570c5d273e199ef6c22ae0766083093c476d9413fe7f2074ad435ead41' 
  AND token = '+M54WDnwoHB+VXxsdC+GwShbBY/FUC3LVNlBqs9ov4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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