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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd416390073d9858d7c01680f6dc0ddb844faf835d7ba5e4221522f37e4e3d99b' 
  AND token = '3rg2WYJTAKuyHOYat6b8UfELM6cyhiUaGjjcmlX8u/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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