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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71113b825ee6a86e47fceb99816512e33a307fbe661569c5bf8a77350b7e1d20' 
  AND token = 'JX1WxpKMWu7C1Hc8e3mad3G9sWqTIBXv2nvh79dIWNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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