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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493d924fb57434d7154650d7189cea35aa377824292157a3ec144594bd2cc76b' 
  AND token = 'zN2MGrzNdy9D4l8hxKCwCX5VZLGZWcTQ0B3Kta8M0Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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