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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fc94b6b240b36395350400d9835905276a199ff489a4ad5fa4f3899a413466' 
  AND token = 'zbHSfWqg5AKfrjZ0t7Pzv0ToyIrUGE9maTFKjPP2gg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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