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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f736e8907161f9de9187cfa0592f6f46cb92adb386b8f1d86d60fe6a1ddf74d9' 
  AND token = 'A/qCw5XNRUecdFRAhSTKrT4ldr49edANQyzsVt6Odvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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