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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec928830a26bc2fb7bd1eda34b436815f309af7b485cbfb4e3d3aafe74d75cea' 
  AND token = '8iScyvLvKPAr2ZcqDpukLHVAI7Uezyqt0vZ15P8Cu+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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