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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba611c1904ce355a5a2227584af1ea6a541a0cb24afcc8d939b241e6ce59c4d' 
  AND token = 'Gnec5byu3g6x1ZyHOitzbdIWFhTj4bLcPO10mqjGxbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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