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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9513f48fe330aac1479edb8cf693b4a17f277adca20fb1655dbe5bbfa5eae4' 
  AND token = '647VlPjhP1lzqisVDzDM1FN2FavckslwAO1bEzZtP90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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