SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959d72797c58a393e06c4f7897c913a8dccc03e37c1578d486e822ddfd299387' 
  AND token = 'KTkqhtVXSGzrWHDMCj/ot/1mtIK0bLaPbN+/YDvBQ7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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