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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0723615c829df561c783cec5711e8f4d5bca1500f3bb2f3b92f854e4f2ad3f17' 
  AND token = 'UMNWu3vorlA920fP8Nhva7Q74GxTj24HiTlYKfODnTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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