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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3deda85d2de77a6f23f3d2441f80e33e7cee4af69f3cf1807b9719fe845eebd1' 
  AND token = '9CBGAZB4SLyUMndBjG4cCa4WxJE6mEhVdlbfOnKUrec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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