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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6acab2f488f2ff6fedf190f59b6cc3a670251943b115adb797c5630dea2185f8' 
  AND token = 'JmLvrs5Z0ZMUyirVnERrMypIBp23An9+lrz33fBRUl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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