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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db32abbabc0d752c8a4d58180f459aa93081141732db563a34a2dc20d4b532c' 
  AND token = 'qYG26kgGiw7K2DI3U2lRw5of0vOuqfu6v9MDlMoxaIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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