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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d28f665819249b318b272922d4b1acdd80250bbbbc1ebf039a53ed90a6f673' 
  AND token = '+ST7cE9ffj4nYmyxsa4yEXrxZf82KYhspZGKXmaTrbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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