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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bd06ec16431b5b4d2026ae08b911888e2352f8cef794ea168a9bc9c8a05d66' 
  AND token = 'FDgDZoFEwRss1S66f3nppn74N9ryOOO7z9t+s+8cKDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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