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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9994d59b725a117f0f866159a867c4ecb581895a5c4df645e006256e8a4bd3a1' 
  AND token = 'LwsHi2n85UxO8BgMQh3tjuSV21446lF1nKYNpaBGU2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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