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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a23b065981a43e362139b7be02ed7363b11615fc0c20fab7daa872adf37f34' 
  AND token = 'd/pVjJSmQ0p0hVh7QWDMrlfM9nMSF5yCX1J6TitxvcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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