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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b67c75ffb34a895b2f803ec23f75cc6a759ca04ccc30eb3a4b4c148502d963' 
  AND token = 'YsxZPZ0ViS8Q7aEaU8dJZQrUaKPCpuAcmyTEcF6BJOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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