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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fffba3cb9966086a6c5c14535f785437b3675d2c35bf13309c173c2749d72f' 
  AND token = 'sn91WgAawYVydnKTgYPfHuTp0hW5GAZkC72vo06Y0AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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