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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9e6cac85f4b31ac24c8e2faa8d78c5ad60850284a5064e68a58b08aacb3544c' 
  AND token = '9SyGqiMdwCuoJG9pD3JxVzdQ35BM5HE87jqlcOk292U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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