SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10a1b054f20eb1de74ba795b3555638e761ea9d91865f42575a280c18d6638b' 
  AND token = 'QVjvIgh8PYbG5VRL/wbm1idKCAEhEaYxtis7GMqBa7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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