Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8693c69895c5203886cff42c3df4cd10de4dfd0d6df2bce4d1c1adeac85c2e' 
  AND token = 'f7dXUcEIZcBz1vDmkLbX2eT4eeZ5mNsXyw8aFndT8E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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