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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36e080e7dd602a35fc12883a12d2bb8f893734a8350acd3baf8e9082a544276' 
  AND token = 'l/ZiPGc1BJfOQ1NXPtbZ9YMsI2K9c4OhshHuP0V/IYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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