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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e0804a9e536d8a0c8c143057794fc6728575a8e76e8a7f6a8a546866accfb5' 
  AND token = '8MqkBmleZw75YQYB5/qMuVr3xfiZXqK4+5uoh0D9sCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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