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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513d1fd3a244a48ad0015076a28d3a18def9a7b89a0be5e76a83da20de338fa0' 
  AND token = 'sDc4XPojkU/o10goS8zJYxtboC/VR7WAMpz2p5M2P9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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