SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452e30702b47809c2a1aff4e2c5d25f3528c5d35e163c7610b1b633c57bdba8f' 
  AND token = 'BbvigAI/EIG4wCl24WkHu/LllR3ZfVHME5aqq9hIjqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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