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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30254c92acf904370544dfba7aa01b4a55cef32d4e3f7a306f59cfd4c80536bd' 
  AND token = 'zGa4v689YgB5cmuUIOWhNtME+lHo/+7t12owORZzcH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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