Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d33e2a070899d777ce97485b4083dda9ed49bd9d697241ae3b9517506372c9f' 
  AND token = 'DgBPzXJ9wyTo+Gi0rB30w92/w1BGKxuL1TnzKRNfdHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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