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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29de4ac5504a1868b355fdb62bb0205812621d961a3a2616a740aa6a9e9a7254' 
  AND token = 'ndX3/UtoNYf9uZnIht/UxeS4yvr/vXgiZAXUJV7pGzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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