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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037318860ddb471b3c92262880cfb4200fff7a3270c6338362d5fca610c63f5a' 
  AND token = 'LclTPZnnS5WNqhLMgQA/0ejB+eHlgUd9xkrpmSlPt/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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