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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65bd58dfd53731e445b42e5808929e364b37ec32798148863b11cffb26434a89' 
  AND token = '6CqEGTTxow/Y4c1WTGvdVDkc367gLoKkE7ZITYbCz4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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