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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d94d1adc296a24880c8649049df65cd72ad069c824d7239dd5c88269940236' 
  AND token = 'm8lWlnq/tT+olrjXmVY8dTFYT/eptl8B7eRk5bEwLwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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