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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da10f9826cd05207bb2e090c7d227aa7a305bc66a7c590513519a4cd083350e' 
  AND token = 'cQyXMvg9ojt4d8PZ4ukXsdT5ZNAuiiFwcUXcnx4Es7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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