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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c55777e42973452df44f11277815d653aa4b99ca5d914ee2b677e560e8426fa' 
  AND token = 'ih9G5/YSDesjj9WzdnY1AggRHfanXxRBBCSZ17FcjqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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