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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bb77a9e78ddad31e61bfa4dbc196b973a01694acd26cd8a3e0c12988040fdf' 
  AND token = 'PPYmnlv01fWevo0uKM8DncUi7hgs4z37rO7F+KUeCYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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