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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe9f2c953553da372406e4f7a30ccc3d564db3abe0ddd9434578b6ea1c10933' 
  AND token = 'H59/xzXNiGJKkQdgGP7cu0YroXsaiEgH+3o47Xmnsbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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