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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b898f14394b6adf44239b45584661ba71e20c039efa1ea46b8cda6efc1b09846' 
  AND token = 'QYOhvPYDa+EdLixH/AyuuCuhieHQvolJ2EKebQETZuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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