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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19be0568da15e26d9b8e71773c74e5db7ae634faf20a378072fb0611813f62fa' 
  AND token = 'iIXEDXJy//lisdH88D7L+7CNilR5qOnSVQGFnDEtOLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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