SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a3192b67322c58a943cf33ba51260f7ac062039635340e114f9d68738b5955' 
  AND token = 'XE6hBdJKbn7/kqtD9wdxtcmnHIsYD5RYJQH+7O9bZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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