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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659c30e5edf91860ed7337100c727f9998d6ba9be9dd36aa73db1fc786abb6f4' 
  AND token = 'erOJ7EamFtqIEKTW9W23SkZJW82oYOPoIaogcWmEmTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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