Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756a056b15ecc80562e2e010060d2d50027ef083f393d50d2c940f01a9547da9' 
  AND token = 'cXpsS+a+WAkVM04sBx6GRRw+EsVWLX0bgG46oEwOHm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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