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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5cc21f4ed539ba19f157a5aea07bb0004763716b8320c7315665d5b7b4a987' 
  AND token = 'saU47EKrM5V//MjRtsCHJu5LtIaRnYzJ0mKJp/4CI9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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