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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240b53f59a51cd7ad4a65834926d467e5ddb79ea8e4ee9b388137038a10c1c76' 
  AND token = 'c7T7enN6AOoSOXImTnhoJOtoRjGxv+WBIvHx5+d2+XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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