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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87df48f039ac80a4c3e750f396aa30ef48a57df94d70631290eea468f16cf47' 
  AND token = 'MH/oM9GYgPf++HbrtGVRzPq8hTPcIBnsbmUU4cGssb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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