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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed9705d3f7a5ae36e58624f78034b5bb0c659134e9e070e8e912ba8484eb7ff' 
  AND token = 'oC6qniva3IwsWZiQ9Sbit2MLaY1VBkaZM5bXB9QhW08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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