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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ea3b92baa0e00ac899518f010b003594cc7e2685711901214ea5a65549c62b' 
  AND token = 'mNCsIBcCcfGasjIkjaFf3C8znumHMBBkfxFFMre7Ejc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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