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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a4031bd730c05a11fe92ca90a36f89e26184ed22a11f62c0aa6c4a85f80e8b' 
  AND token = 'mLiSH8hj0lkgXz6VrAm9DTWuO0SN3WnHhfE7zIsV1wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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