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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd971e539888120152093711e6d512e0ab4a3cc30690280c574967686a6807832' 
  AND token = 'XKPo+7D5Vfd36elrKhyR/xDE1719UnMHex6dBKAlahs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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