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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1c5f756a9e4fb6dfd12c36733a9c8ec096b5e6be4fa64a8085d6ef1b1cd784' 
  AND token = 'K20XiTKspfv/LaxhE8aMeWXwCmxUk4s8904TgXnn0Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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