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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee4bda77530774bd3dee6df7611b9ad74fbfe59c5b8a8a889a51da82458e2ec' 
  AND token = '3A3FHgRqDYMhZUBTAYzrqs5LqZ4aYUZ6snVbkuIU27M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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