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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c335eeb71e1d5a87d337a89bb8d80ce77b482e906dcd23695a1a96923f3c8ed9' 
  AND token = '3LtJPptKFAvb9vOMp0P0kzsm0SIy8QnmU59XiP6wuTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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