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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d5ef764314a608ff3ba388424bd3f11bb9ccf8c3708e11cec39c5bb63d76b7' 
  AND token = 'rajHM5G+AcMjG9lB/vjxIERIG/Vi7NwzPcC+OVi9dP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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