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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3538300fcdfef9967a0ae8db45adb9b5e9584af943ea7f68e72b14dbbc47fc95' 
  AND token = 'yUqZchb7oBrHhfRv5Cr7FCXPYxGjlUPlcpr+kk26HfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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