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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5a06ed67d70fc3837ec87596348da28136df86f6e3f42689178cf533bc4b76' 
  AND token = 'IuU4GSnu589EaESEdqnswM+xfxmiYv0z1eySMhdNW8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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