SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e97495f14fc767c917ad0c5348ab1fd7f3a187fba5567c4846981f0d6798ceb' 
  AND token = 'V2L6xjVPqglnrGvrKZik0wgUE/pfc6ntEdH5nFI2KJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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