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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d06cff4d0e6451557f1e298bdefdfee75495db8d0356056f408d18fa5cc48e3' 
  AND token = 'snISqoUrCh8NCDWzHpPQjcP0seaBNU+eaVwDagND4ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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