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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9236056e739934246f79338b9ed650a8ea48cf2d30ca36cd4f72c2c8359467af' 
  AND token = 'nKB+6esV5Gx64nLbbKV5Eb0ACeHHyywt4X0idortGwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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