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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d676b92a70cf0bba4166997e2d0618ec92bca491ee190b75a94baa4a6a5d97' 
  AND token = '/OvLW0L2xtx9Nr4E4l/Nvi1d2UlCRc8s2RRLRzEllDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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