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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1646e2dd3364ff0bed4cdda000e5d74f24af0d4bdb15c29f1f540c716276e41f' 
  AND token = 'INhVpvugqvSlNjkU/oR9sktNen+NuFjdRV0TcvNs8zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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