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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3792312793bb86637415a2ea5479a7074bb905fa5deded1e16820344b3470c29' 
  AND token = 'g98jgIQHgfmgSSDXDVy9Jjw3W/2LEROWl4gTV9ZoBIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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