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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe487a25cd8e504ca1a796c85e4e1e5800ce1d659e9c3a048d47a356e7f0131' 
  AND token = '7pWyGrrwiS88XRV7uZH/Qu3ydZz/3QhqRypz2dXNbrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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