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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28d67d78c2cf1656042d7531b15c6f3544b3bd4b054461665a39b9c63d525b8' 
  AND token = '+CT+bsqyUeZuAenrFCu4kL4ZZxjzn6wf38ZoP7XUT4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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