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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f6a470ce6d1cdd2c36b7bf0233d2b36bdc64956d9bb6d299f46ad0f7c0f4b1' 
  AND token = 'u4hVGutIiG0Uibjl035XGqUYpharw4UtMn6plWeS7cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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