SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0e186262485f97514a554773161b348493d400540d038fb877f03d03694af7' 
  AND token = 'uFZOupuHKTPagjiU4rpgIL8glbF2H4wJWBIntFbJjrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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