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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c24a86a97dc35730823802a632aac05d4f45f665feb3b2463a4e00554055cd' 
  AND token = 'T0c9upd+EuSTTgQamJj7XO79lT78V3JR64ttLR19aos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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