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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adba5181b8eead6cd13645d472640086e55ed4dd60cc01a291d93acc454d31d' 
  AND token = 'tqnczYbOZ2POz5Ojd17gYm5YV5wuwOE+6Pw5/pxG+vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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