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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3956c99f7e97ed3d9fce7fa05e22a9544371ea4abd7c6928cb167fc80af7ae94' 
  AND token = '7LvbjZ41av8kGiw3kYSLf6Wr9aClQQ2MBOXeLdpaHcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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