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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd165d2cbf9c54e1eb0665a3adcd772311f1f1a79122ee222620e5d49c1c93c11' 
  AND token = 'SPFl65eUGUm20GknaYZasPB7Noeg/0HRjM7LaCYQ9g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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