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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36dbf0af083db34cd3a116d55ee164bdfc4b83550573b3c8b9f3af8668ebd9a1' 
  AND token = 'jLUTeDV5+wM7C5jr5ikBnrBLg9ZIeFkrRjtrMM+gADU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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