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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c556c5d301a31a68c696e6538e592370d9294c97bcb7ede1700e495361e8e059' 
  AND token = 'XNSSfmwolO1BkNv5L+zYEH3kpJYvF7UwB+Tk7rq2zD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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